CN111749921A - Stepless speed regulation fan control system and method - Google Patents
Stepless speed regulation fan control system and method Download PDFInfo
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- CN111749921A CN111749921A CN202010593818.4A CN202010593818A CN111749921A CN 111749921 A CN111749921 A CN 111749921A CN 202010593818 A CN202010593818 A CN 202010593818A CN 111749921 A CN111749921 A CN 111749921A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
- F01P7/048—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2050/00—Applications
- F01P2050/22—Motor-cars
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention belongs to the technical field of automobile heat dissipation, and discloses a stepless speed regulation fan control system and method. The system comprises an engine control unit, a fan control unit and a fan assembly, wherein the engine control unit acquires a vehicle control signal and generates a corresponding PWM (pulse-width modulation) speed regulation signal according to the vehicle control signal; the engine control unit outputs the PWM speed regulating signal to the fan control unit; and the fan control unit controls the fan assembly to operate according to the PWM speed regulation signal. According to the invention, the corresponding PWM speed regulating signal is generated according to the vehicle control signal to control the fan rotating speed in the fan assembly, the rotating speed range of the PWM speed regulating signal is wide, the excessive cooling efficiency can be avoided, and the oil consumption can be saved, so that the problems that the speed regulating mode of the automobile electronic fan cannot be adjusted as required, the energy consumption is large, and the noise is large are solved.
Description
Technical Field
The invention relates to the technical field of automobile heat dissipation, in particular to a stepless speed regulation fan control system and a stepless speed regulation fan control method.
Background
In order to control the operating temperature of the engine during operation of the vehicle, the engine compartment of the vehicle is provided with a radiator fan, which is generally mounted behind the radiator (on the side close to the engine compartment) and which, when activated, draws air from the front grille, through the radiator and into the engine compartment for heat dissipation. The automobile cooling system consists of a radiator, an electronic fan, a circuit and the like, for example, a traditional high-speed and low-speed two-stage speed regulation fan is adopted, and an engine management system pulls down or disconnects a relay for controlling the fan to operate according to the water temperature of an engine, the air conditioning state or other control requirements, so that the fan is controlled to be turned on or off, and the water temperature of the engine is maintained in a reasonable range.
With the increasing prosperity of the automobile market, customers pay more attention to the oil consumption problem and the noise problem of the automobile, energy conservation and noise reduction become the key focus of automobile design, especially the requirements on heat dissipation and NVH (noise, vibration and sound vibration roughness) performance are higher and higher, and the high-speed and low-speed mode of controlling the cooling and heat dissipation fan through the relay cannot meet the requirements on energy conservation, emission reduction and noise reduction of the whole automobile in the automobile with higher requirements on the NVH (noise, vibration and sound vibration roughness) performance due to the problems of high oil consumption, low heat dissipation efficiency and high noise, and especially for high-power engines and motors, the energy consumption reduction is very important. The electronic fans commonly used on domestic passenger cars at present are high-speed and low-speed electronic fans, the speed regulation mode is generally series-parallel connection or resistance type speed regulation, and the speed regulation mode cannot realize the characteristic that the rotating speed of the fan can be regulated according to the requirement.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a stepless speed regulation fan control system and a stepless speed regulation fan control method, and aims to solve the technical problems that the existing speed regulation mode of an automobile electronic fan cannot be regulated as required, and the energy consumption is high and the noise is large.
In order to achieve the purpose, the invention provides a stepless speed regulation fan control system which comprises an engine control unit, a fan control unit and a fan assembly, wherein the engine control unit is connected with the fan control unit, and the fan control unit is connected with the fan assembly; wherein the content of the first and second substances,
the engine control unit is used for acquiring vehicle control signals and generating corresponding PWM speed regulating signals according to the vehicle control signals;
the engine control unit is also used for outputting the PWM speed regulating signal to the fan control unit;
and the fan control unit is used for controlling the fan assembly to operate according to the PWM speed regulating signal.
Preferably, the stepless speed regulation fan control system further comprises a power supply unit, wherein the power supply unit comprises a storage battery, a main relay and a fan relay; wherein the content of the first and second substances,
the storage battery is respectively connected with the input end of the main relay and the input end of the fan relay, the output end of the main relay is connected with the power input end of the engine control unit, and the output end of the fan relay is connected with the power input end of the fan control unit.
Preferably, the fan control unit comprises a first connector, a second connector and a single chip microcomputer; wherein the content of the first and second substances,
the signal input part of the first connector is connected with the signal output part of the engine control unit, the power input part of the first connector is connected with the output end of the fan relay, the grounding end of the first connector is grounded, the output end of the first connector is connected with the single chip microcomputer, the positive output end of the second connector is connected with the positive end of the fan assembly, the negative output end of the second connector is connected with the negative end of the fan assembly, and the input end of the second connector is connected with the single chip microcomputer.
Preferably, the first connector comprises a card interface circuit, and the card interface circuit comprises a first resistor, a second resistor, a first triode and a second triode; wherein the content of the first and second substances,
the first end of first resistance is connected with external power supply, the second end of first resistance with the base of first triode is connected, the projecting pole of first triode is connected with chip operating voltage, the collecting electrode of first triode with the first end of second resistance is connected, the first end of second resistance with the singlechip is connected, the second end ground connection of second resistance, the second end of first resistance with the collecting electrode of second triode is connected, the base of second triode with the singlechip is connected, the projecting pole ground connection of second triode, the second end of first resistance with engine control unit connects.
Preferably, the engine control unit comprises an engine controller and an output interface circuit, wherein the output interface circuit comprises a third triode; wherein the content of the first and second substances,
the base electrode of the third triode is connected with the engine controller, the collector electrode of the third triode is connected with the plug-in interface circuit, and the emitting electrode of the third triode is grounded.
Preferably, the fan control unit further comprises a voltage division module and a sampling module; the output end of the first connector is connected with the input end of the voltage division module, the output end of the voltage division module is connected with the single chip microcomputer, the input end of the sampling module is connected with the output end of the fan assembly, and the output end of the sampling module is connected with the single chip microcomputer.
Preferably, the fan control unit further comprises a reverse connection protection module; the input end of the reverse connection protection module is connected with the output end of the first connector, and the output end of the reverse connection protection module is connected with the single chip microcomputer.
In addition, in order to achieve the above object, the present invention further provides a stepless speed regulation fan control method applied to the stepless speed regulation fan control system, where the stepless speed regulation fan control method includes:
the method comprises the following steps that an engine control unit collects vehicle control signals and generates corresponding PWM speed regulating signals according to the vehicle control signals;
the engine control unit outputs the PWM speed regulating signal to a fan control unit;
and the fan control unit controls the fan assembly to operate according to the PWM speed regulation signal.
Preferably, after the step of controlling the fan assembly to operate according to the PWM speed regulation signal, the fan control unit further includes:
the fan assembly feeds a fault signal back to the fan control unit;
the fan control unit sends the fault signal to the engine control unit through a PWM hard wire;
and the engine control unit adjusts the PWM speed regulating signal according to the fault signal and outputs the adjusted PWM speed regulating signal to the fan control unit.
Preferably, the step of controlling the operation of the fan assembly by the fan control unit according to the PWM speed regulation signal specifically includes:
when the duty ratio output by the PWM speed regulating signal is in a first preset range or a second preset range, the fan control unit controls the full-speed operation of a motor in the fan assembly according to the PWM speed regulating signal;
when the duty ratio output by the PWM speed regulating signal is within a third preset range, the fan control unit controls the motor to stop running according to the PWM speed regulating signal;
when the duty ratio output by the PWM speed regulating signal is in a fourth preset range, the fan control unit controls the motor to rotate at a linear rotating speed according to the PWM speed regulating signal;
and when the duty ratio output by the PWM speed regulating signal is within a fifth preset range, the fan control unit prevents the motor from shaking according to the PWM speed regulating signal.
The invention provides a stepless speed regulation fan control system, which comprises an engine control unit, a fan control unit and a fan assembly, wherein the engine control unit is connected with the fan control unit; the engine control unit is used for acquiring vehicle control signals and generating corresponding PWM speed regulating signals according to the vehicle control signals; the engine control unit is also used for outputting the PWM speed regulating signal to the fan control unit; and the fan control unit is used for controlling the fan assembly to operate according to the PWM speed regulating signal. Through the mode, the corresponding PWM speed regulating signal is generated according to the vehicle control signal of the running state of the whole vehicle, the fan rotating speed in the fan assembly is controlled, the rotating speed control range of the PWM speed regulating signal is wide, the situation that the traditional high-speed and low-speed fans have excessive cooling efficiency can be effectively avoided, and oil consumption is saved, so that the technical problems that the existing speed regulating mode of the electronic fan of the automobile cannot be adjusted as required, and energy consumption is high and noise is high are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a stepless speed regulating fan control system according to the present invention;
FIG. 2 is a schematic diagram of a power supply circuit according to an embodiment of the stepless speed regulating fan control system of the present invention;
FIG. 3 is a schematic diagram of an interface circuit structure of an embodiment of a stepless speed regulation fan control system according to the present invention;
FIG. 4 is a flowchart illustrating a method for controlling a stepless speed-regulating fan according to a first embodiment of the present invention;
fig. 5 is a flowchart illustrating a method for controlling a stepless speed-regulating fan according to a second embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a stepless speed regulation fan control system.
Referring to fig. 1, in the embodiment of the present invention, the stepless speed regulation fan control system includes an engine control unit 100, a fan control unit 200, and a fan assembly 300, where the engine control unit 100 is connected to the fan control unit 200, and the fan control unit 200 is connected to the fan assembly 300; wherein the content of the first and second substances,
the engine control unit 100 is configured to collect a vehicle control signal and generate a corresponding PWM speed control signal according to the vehicle control signal. In this embodiment, the vehicle control signal may include a switch request signal, a pressure signal, a water temperature signal, a vehicle speed signal of a wheel speed sensor, an engine operating state signal, and the like, wherein the switch, the pressure sensor, and the water temperature sensor may be connected to the engine control unit 100 through a PWM hard wire, the switch request signal, the pressure signal, or the water temperature signal may be respectively transmitted to the engine control unit 100 through the PWM hard wire, and the switch request signal may include an on signal and an off signal. The wheel speed sensor CAN be connected with the engine control unit 100 through a finished vehicle CAN line, and a vehicle speed signal of the wheel speed sensor is transmitted to the engine control unit 100 through the finished vehicle CAN line. The crankshaft speed signal may be hard-wired to the engine control unit 100. The vehicle control signal may also include other signals, which is not limited in this embodiment.
The engine control unit 100 is further configured to output the PWM speed regulation signal to the fan control unit 200. In this embodiment, different vehicle control signals are subjected to different PWM speed regulation signal settings under different conditions, such as different vehicle speeds, different air conditioner states, different medium voltage switch signals, and a transmission control system fan request, and the specific PWM speed regulation signal setting values under different conditions may be set according to experiments. In order to verify the rationality of the specific set value of the PWM speed regulating signal, a water temperature heat balance test can be carried out in an environment bin, the water temperature can be stably controlled under all limit working conditions of a vehicle type in the test process, the phenomena of overhigh and overlow water temperature are avoided, and the rationality of the model selection of a fan and the specific set value of the PWM speed regulating signal can be successfully verified.
And the fan control unit 200 is configured to control the fan assembly 300 to operate according to the PWM speed regulation signal. In this embodiment, the fan assembly 300 may include a fan blade, a fan frame, a motor, a water tank, and the like. Specifically, for example, when the inverter system, the transmission system, and the air conditioning system have a cooling demand, the fan start request signal is sent to the engine control unit 100 through the CAN bus, the engine control unit 100 sends the PWM speed regulation signal to the fan control unit 200, and after receiving the PWM speed regulation signal, the fan control unit 200 may output different voltages to control the stepless electronic fan in the fan assembly 300 to operate at different rotational speeds.
The embodiment provides a stepless speed regulation fan control system, which comprises an engine control unit 100, a fan control unit 200 and a fan assembly 300, wherein the engine control unit 100 is connected with the fan control unit 200, and the fan control unit 200 is connected with the fan assembly 300; the engine control unit 100 is configured to collect a vehicle control signal and generate a corresponding PWM speed regulation signal according to the vehicle control signal; the engine control unit 100 is further configured to output the PWM speed regulation signal to the fan control unit 200; and the fan control unit 200 is configured to control the fan assembly 300 to operate according to the PWM speed regulation signal. Through the mode, the corresponding PWM speed regulating signal is generated according to the vehicle control signal of the running state of the whole vehicle, the fan rotating speed in the fan assembly is controlled, the rotating speed control range of the PWM speed regulating signal is wide, the situation that the traditional high-speed and low-speed fans have excessive cooling efficiency can be effectively avoided, oil consumption is saved, and meanwhile, in a low-speed running area of the fans, the noise of the fans can be obviously reduced, so that the technical problems that the existing speed regulating mode of the electronic fan of the automobile cannot be adjusted as required, and energy consumption is high and noise is high are solved.
Further, referring to fig. 2, the stepless speed regulation fan control system further includes a power supply unit 400, and the power supply unit 400 includes a storage battery SC, a main relay K1, and a fan relay K2; wherein the content of the first and second substances,
the storage battery SC is connected to the input terminals of the main relay K1 and the fan relay K2, respectively, the output terminal of the main relay K1 is connected to the power input terminal of the engine control unit 100, and the output terminal of the fan relay K2 is connected to the power input terminal of the fan control unit 200.
It should be noted that the power supply unit 400 includes a storage battery SC, a main relay K1, and a fan relay K2, and the power supply unit 400 may further include other resistance elements (not shown).
Further, referring to fig. 2, the fan control unit 200 includes a first connector 201, a second connector 202, and a single chip microcomputer U1; wherein the content of the first and second substances,
the signal input part of the first connector 201 is connected with the signal output part of the engine control unit 100, the power input part of the first connector 201 is connected with the output end of the fan relay K2, the grounding end of the first connector 201 is grounded, the output end of the first connector 201 is connected with the single chip microcomputer U1, the positive output end of the second connector 202 is connected with the positive end of the fan assembly 300, the negative output end of the second connector 202 is connected with the negative end of the fan assembly 300, and the input end of the second connector 202 is connected with the single chip microcomputer U1.
It should be noted that, the first connector 201 may be a complete vehicle connector, the signal input end of the first connector 201 is connected to the signal output end of the engine control unit 100, and receives the PWM speed-adjusting signal output by the engine control unit 100, the PWM speed-adjusting signal may be divided into three forms, which are respectively a high impedance state, a high level, and a low level. The power input end of the first connector 201 is connected with the storage battery SC through the fan relay K2, the storage battery SC is used as a power supply, and the grounding end of the first connector 201 is grounded.
It should be appreciated that the second connector 202 may be a fan connector, and the second connector 202 is connected to a motor in the fan assembly 300.
Further, referring to fig. 3, the first connector 201 includes a card interface circuit 2011, and the card interface circuit 2011 includes a first resistor R1, a second resistor R2, a first transistor Q1, and a second transistor Q2; wherein the content of the first and second substances,
the first end of first resistance R1 is connected with external power source VCC, the second end of first resistance R1 with first triode Q1's base is connected, the projecting pole of first triode Q1 is connected with chip operating voltage V, the collecting electrode of first triode Q1 with the first end of second resistance R2 is connected, the first end of second resistance R2 with singlechip U1 is connected, the second end ground connection of second resistance R2, the second end of first resistance R1 with the collecting electrode of second triode Q2 is connected, the base of second triode Q2 with singlechip U1 is connected, the projecting pole ground connection of second triode Q2, the second end of first resistance R1 with engine control unit 100 connects.
The card interface circuit 2011 is an interface circuit between the engine control unit 100 and the fan control unit 200. The input level of the PWM speed regulating signal is only divided into a high level and a low level, and a state between the high level and the low level does not exist, so that even if the input level of the PWM speed regulating signal is between the high level and the low level, the output level is only the high level or the low level.
Further, referring to fig. 3, the engine control unit 100 includes an engine controller ECU and an output interface circuit 101, and the output interface circuit 101 includes a third transistor Q3; wherein the content of the first and second substances,
the base of the third transistor Q3 is connected to the engine controller ECU, the collector of the third transistor Q3 is connected to the engine controller ECU, the collector of the third transistor Q3 is connected to the card interface circuit 2011, and the emitter of the third transistor Q3 is grounded.
The engine control unit 100 includes an engine controller ECU and an output interface circuit 101, and the output interface circuit 101 is an interface circuit between the engine control unit 100 and the fan control unit 200.
Further, the fan control unit 200 further includes a voltage dividing module and a sampling module; the output end of the first connector 201 is connected to the input end of the voltage dividing module, the output end of the voltage dividing module is connected to the single chip microcomputer U1, the input end of the sampling module is connected to the output end of the fan assembly 300, and the output end of the sampling module is connected to the single chip microcomputer U1.
It should be noted that the fan control unit 200 further includes a voltage dividing module and a sampling module (not shown), where the sampling module may include a current sampling module, a voltage sampling module, a temperature sampling module, and the like. The fan control unit 200 may analyze fault information according to a motor, a PWM speed regulation signal, and a feedback signal of a sampling module inside the fan control unit 200, where the fault information may include an undervoltage, an overvoltage, a controller over-temperature, a fan stall, a fan open circuit, and the like.
Further, the fan control unit 200 further includes a reverse connection protection module; the input end of the reverse connection protection module is connected with the output end of the first connector 201, and the output end of the reverse connection protection module is connected with the single chip microcomputer U1.
It should be noted that, the fan control unit 200 further includes a reverse connection protection module (not shown), the reverse connection protection module receives the power supply Vbat of the storage battery SC through the first connector 201, when-13.5V < Vbat <0V, the reverse connection protection module protects the fan control unit 200 from working, the motor in the fan assembly 300 runs at full speed in the reverse direction, and the reverse connection protection module protects the fan control unit 200 from damage in 2 minutes.
In addition, in order to achieve the above object, the present invention also provides a stepless speed regulating fan control method applied to the stepless speed regulating fan control system as described above.
An embodiment of the present invention provides a method for controlling a stepless speed-regulating fan, and referring to fig. 4, fig. 4 is a schematic flow chart of a first embodiment of the method for controlling a stepless speed-regulating fan according to the present invention.
In this embodiment, the method for controlling a stepless speed-regulating fan includes the following steps:
step S10: the engine control unit collects vehicle control signals and generates corresponding PWM speed regulating signals according to the vehicle control signals.
It should be noted that the vehicle control signal may include a switch request signal, a pressure signal, a water temperature signal, a vehicle speed signal of a wheel speed sensor, an engine operating state signal, and the like, wherein the switch, the pressure sensor, and the water temperature sensor may be connected to the engine control unit through a PWM hard wire, the switch request signal, the pressure signal, or the water temperature signal may be respectively transmitted to the engine control unit through the PWM hard wire, and the switch request signal may include an on signal and an off signal. The wheel speed sensor CAN be connected with the engine control unit through a finished automobile CAN line, and a vehicle speed signal of the wheel speed sensor is transmitted to the engine control unit through the finished automobile CAN line. The crankshaft rotating speed signal can be connected with the engine control unit through a hard wire, and the engine control unit collects the vehicle control signal and generates a corresponding PWM speed regulating signal according to the vehicle control signal. The vehicle control signal may also include other signals, which is not limited in this embodiment.
Step S20: and the engine control unit outputs the PWM speed regulating signal to the fan control unit.
It should be noted that, according to different conditions such as different vehicle speeds, different air conditioner states, different medium voltage switch signals, and a fan request of a transmission control system, different vehicle control signals are subjected to differentiated PWM speed regulation signal settings, and specific setting values of the PWM speed regulation signals under different conditions may be as shown in fig. 2. In order to verify the rationality of the specific set value of the PWM speed regulating signal, a water temperature heat balance test can be carried out in an environment bin, the water temperature can be stably controlled under all limit working conditions of a vehicle type in the test process, the phenomena of overhigh and overlow water temperature are avoided, and the rationality of the model selection of a fan and the specific set value of the PWM speed regulating signal can be successfully verified.
Step S30: and the fan control unit controls the fan assembly to operate according to the PWM speed regulation signal.
It should be noted that, the step of controlling the operation of the fan assembly by the fan control unit according to the PWM speed regulation signal specifically includes: when the duty ratio output by the PWM speed regulating signal is in a first preset range or a second preset range, the fan control unit controls the full-speed operation of a motor in the fan assembly according to the PWM speed regulating signal; when the duty ratio output by the PWM speed regulating signal is within a third preset range, the fan control unit controls the motor to stop running according to the PWM speed regulating signal; when the duty ratio output by the PWM speed regulating signal is in a fourth preset range, the fan control unit controls the motor to rotate at a linear rotating speed according to the PWM speed regulating signal; and when the duty ratio output by the PWM speed regulating signal is within a fifth preset range, the fan control unit prevents the motor from shaking according to the PWM speed regulating signal.
It is easy to understand that, after the step of controlling the operation of the fan assembly according to the PWM speed regulation signal, the fan control unit further includes: the fan assembly feeds a fault signal back to the fan control unit; the fan control unit sends the fault signal to the engine control unit through a PWM hard wire; and the engine control unit adjusts the PWM speed regulating signal according to the fault signal and outputs the adjusted PWM speed regulating signal to the fan control unit.
Specifically, the fan assembly may include a fan blade, a fan frame, a motor, a water tank, and the like. Specifically, for example, when the inverter system, the transmission system and the air conditioning system have cooling requirements, the fan start request signal is sent to the engine control unit through the CAN bus, the engine control unit sends a PWM speed regulation signal to the fan control unit, and the fan control unit CAN output different voltages to control the stepless electronic fan in the fan assembly to operate at different rotating speeds after receiving the PWM speed regulation signal.
In the embodiment, an engine control unit is used for acquiring vehicle control signals and generating corresponding PWM speed regulating signals according to the vehicle control signals; the engine control unit outputs the PWM speed regulating signal to a fan control unit; and the fan control unit controls the fan assembly to operate according to the PWM speed regulation signal. Through the mode, the corresponding PWM speed regulating signal is generated according to the vehicle control signal of the running state of the whole vehicle, the fan rotating speed in the fan assembly is controlled, the rotating speed control range of the PWM speed regulating signal is wide, the situation that the traditional high-speed and low-speed fans have excessive cooling efficiency can be effectively avoided, oil consumption is saved, and meanwhile, in a low-speed running area of the fans, the noise of the fans can be obviously reduced, so that the technical problems that the existing speed regulating mode of the electronic fan of the automobile cannot be adjusted as required, and energy consumption is high and noise is high are solved.
Referring to fig. 5, fig. 5 is a flowchart illustrating a method for controlling a stepless speed-regulating fan according to a second embodiment of the present invention. Based on the first embodiment, the method for controlling a stepless speed regulation fan in this embodiment specifically includes, in the step S30:
step S301: and when the duty ratio output by the PWM speed regulating signal is within a first preset range or a second preset range, the fan control unit controls the full-speed operation of a motor in the fan assembly according to the PWM speed regulating signal.
It should be noted that, the fan control unit may implement the following functions according to the characteristics of the duty ratio of the PWM speed regulation signal: and turning off the motor, linearly adjusting the rotating speed of the motor and realizing full speed of the motor. In order to avoid the duty ratio of the PWM speed regulating signal from shaking at the boundary of the motor state transition to cause the motor state to be switched continuously, a hysteresis zone is introduced at the boundary of the motor state transition.
Specifically, when the duty ratio output by the PWM speed regulation signal is within a first preset range or a second preset range, the fan control unit controls the full-speed operation of the motor in the fan assembly according to the PWM speed regulation signal, where the frequency of the PWM speed regulation signal may be 40Hz, the first preset range may be 0-4%, and the second preset range may be 89% -100%, and controls the full-speed operation of the motor in the fan assembly according to the PWM speed regulation signal.
Step S302: and the fan control unit controls the motor to stop running according to the PWM speed regulating signal when the duty ratio output by the PWM speed regulating signal is within a third preset range.
It is easy to understand that the third preset range may be 7% to 12%, and when the duty ratio of the PWM speed regulation signal is 7% to 12%, the motor is controlled to stop operating according to the PWM speed regulation signal.
Step S303: and the fan control unit controls the motor to rotate at a linear rotating speed according to the PWM speed regulating signal when the duty ratio output by the PWM speed regulating signal is in a fourth preset range.
It should be noted that the fourth preset range may be 13% to 87%, and when the duty ratio of the PWM speed regulation signal output is 13% to 87%, the motor is controlled to operate at a linear rotation speed according to the PWM speed regulation signal.
Step S304: and when the duty ratio output by the PWM speed regulating signal is within a fifth preset range, the fan control unit prevents the motor from shaking according to the PWM speed regulating signal.
It is easy to understand that the fifth preset range may be 4% -7%, or 12% -13%, or 87% -89%, the fifth preset range is a duty ratio hysteresis region, and when the duty ratio of the PWM speed regulation signal output is 4% -7%, or 12% -13%, or 87% -89%, the motor is prevented from shaking according to the PWM speed regulation signal.
In this embodiment, when the duty ratio output by the PWM speed-adjusting signal is within a first preset range or a second preset range, the fan control unit controls the full-speed operation of the motor in the fan assembly according to the PWM speed-adjusting signal; when the duty ratio output by the PWM speed regulating signal is within a third preset range, the fan control unit controls the motor to stop running according to the PWM speed regulating signal; when the duty ratio output by the PWM speed regulating signal is in a fourth preset range, the fan control unit controls the motor to rotate at a linear rotating speed according to the PWM speed regulating signal; and when the duty ratio output by the PWM speed regulating signal is within a fifth preset range, the fan control unit prevents the motor from shaking according to the PWM speed regulating signal. Through the mode, the corresponding PWM speed regulating signal is generated according to the vehicle control signal of the running state of the whole vehicle, the fan rotating speed in the fan assembly is controlled, the rotating speed control range of the PWM speed regulating signal is wide, the situation that the traditional high-speed and low-speed fans have excessive cooling efficiency can be effectively avoided, oil consumption is saved, and meanwhile, in a low-speed running area of the fans, the noise of the fans can be obviously reduced, so that the technical problems that the existing speed regulating mode of the electronic fan of the automobile cannot be adjusted as required, and energy consumption is high and noise is high are solved.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment can be referred to the stepless speed regulation fan control method provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A stepless speed regulation fan control system is characterized by comprising an engine control unit, a fan control unit and a fan assembly, wherein the engine control unit is connected with the fan control unit; wherein the content of the first and second substances,
the engine control unit is used for acquiring vehicle control signals and generating corresponding PWM speed regulating signals according to the vehicle control signals;
the engine control unit is also used for outputting the PWM speed regulating signal to the fan control unit;
and the fan control unit is used for controlling the fan assembly to operate according to the PWM speed regulating signal.
2. The infinitely variable speed fan control system of claim 1, further comprising a power supply unit, the power supply unit comprising a battery, a main relay, and a fan relay; wherein the content of the first and second substances,
the storage battery is respectively connected with the input end of the main relay and the input end of the fan relay, the output end of the main relay is connected with the power input end of the engine control unit, and the output end of the fan relay is connected with the power input end of the fan control unit.
3. The stepless speed regulating fan control system according to claim 2, wherein the fan control unit comprises a first connector, a second connector and a single chip microcomputer; wherein the content of the first and second substances,
the signal input part of the first connector is connected with the signal output part of the engine control unit, the power input part of the first connector is connected with the output end of the fan relay, the grounding end of the first connector is grounded, the output end of the first connector is connected with the single chip microcomputer, the positive output end of the second connector is connected with the positive end of the fan assembly, the negative output end of the second connector is connected with the negative end of the fan assembly, and the input end of the second connector is connected with the single chip microcomputer.
4. The infinitely variable speed fan control system of claim 3, wherein the first connector comprises a card interface circuit, the card interface circuit comprising a first resistor, a second resistor, a first triode, and a second triode; wherein the content of the first and second substances,
the first end of first resistance is connected with external power supply, the second end of first resistance with the base of first triode is connected, the projecting pole of first triode is connected with chip operating voltage, the collecting electrode of first triode with the first end of second resistance is connected, the first end of second resistance with the singlechip is connected, the second end ground connection of second resistance, the second end of first resistance with the collecting electrode of second triode is connected, the base of second triode with the singlechip is connected, the projecting pole ground connection of second triode, the second end of first resistance with engine control unit connects.
5. The infinitely variable speed fan control system of claim 4, wherein the engine control unit comprises an engine controller and an output interface circuit, the output interface circuit comprising a third triode; wherein the content of the first and second substances,
the base electrode of the third triode is connected with the engine controller, the collector electrode of the third triode is connected with the plug-in interface circuit, and the emitting electrode of the third triode is grounded.
6. The stepless speed regulation fan control system of claim 5, wherein the fan control unit further comprises a voltage division module and a sampling module; the output end of the first connector is connected with the input end of the voltage division module, the output end of the voltage division module is connected with the single chip microcomputer, the input end of the sampling module is connected with the output end of the fan assembly, and the output end of the sampling module is connected with the single chip microcomputer.
7. The infinitely variable speed fan control system of claim 6, wherein the fan control unit further comprises a reverse-connect protection module; the input end of the reverse connection protection module is connected with the output end of the first connector, and the output end of the reverse connection protection module is connected with the single chip microcomputer.
8. A stepless speed regulation fan control method applied to the stepless speed regulation fan control system according to any one of claims 1 to 7, characterized in that the stepless speed regulation fan control method comprises the following steps:
the method comprises the following steps that an engine control unit collects vehicle control signals and generates corresponding PWM speed regulating signals according to the vehicle control signals;
the engine control unit outputs the PWM speed regulating signal to a fan control unit;
and the fan control unit controls the fan assembly to operate according to the PWM speed regulation signal.
9. The method of claim 8, wherein the step of the fan control unit controlling the operation of the fan assembly according to the PWM speed signal is further followed by the step of:
the fan assembly feeds a fault signal back to the fan control unit;
the fan control unit sends the fault signal to the engine control unit through a PWM hard wire;
and the engine control unit adjusts the PWM speed regulating signal according to the fault signal and outputs the adjusted PWM speed regulating signal to the fan control unit.
10. The method for controlling a stepless speed regulation fan according to claim 8, wherein the step of controlling the fan assembly to operate by the fan control unit according to the PWM speed regulation signal specifically comprises:
when the duty ratio output by the PWM speed regulating signal is in a first preset range or a second preset range, the fan control unit controls the full-speed operation of a motor in the fan assembly according to the PWM speed regulating signal;
when the duty ratio output by the PWM speed regulating signal is within a third preset range, the fan control unit controls the motor to stop running according to the PWM speed regulating signal;
when the duty ratio output by the PWM speed regulating signal is in a fourth preset range, the fan control unit controls the motor to rotate at a linear rotating speed according to the PWM speed regulating signal;
and when the duty ratio output by the PWM speed regulating signal is within a fifth preset range, the fan control unit prevents the motor from shaking according to the PWM speed regulating signal.
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Application publication date: 20201009 |